38
D. TROUBLESHOOTING 12 VOLT STARTERS
PROBLEM PROBABLE CAUSE FIX
Does not function Weak or dead battery Check charge and/or replace battery.
Corroded battery terminals and/or Clean terminals and/or connections.
electrical connections
Brushes sticking Free brushes. Replace worn brushes and
those which have come in contact with
grease and oil.
Dirty or oily commutator Clean and dress commutator.
Armature binding or bent Free armature and adjust end play, replace
armature, or replace starter.
Open or shorted armature Replace armature.
Shorted, open or grounded field coil Repair or replace housing.
Loose or faulty electrical connections Correct.
Load on engine Disengage brake.
Electric starter cranks, but no spark Disconnect ignition cut-off wire at the engine.
at spark plug Crank engine. If spark at spark plug, ignition
switch, safety switch is in operative. If no
spark, check air gap. Check wires for poor
connections, cuts or breaks.
Electric starter does not crank engine Remove starter wire. Use a jumper battery
and cables and attach directly to starter wire.
If starter cranks engine the starter is okay,
check solenoid, starter switches, safety
switches and interlock switch. Check wires
for poor connections, cuts or breaks.
Electric starter cranks, but engine Check flywheel ring gear for broken teeth.
does not turn over. Replace flywheel if necessary.
Low RPM Unit controls engaged Insure all unit controls are in neutral or
disengaged.
Worn bearings in cap assemblies Clean bearings or replace cap assemblies.
Bent armature Replace armature.
Binding armature Free up armature. Adjust armature end play.
Brushes not seated properly Correct.
Weak or annealed brush springs Replace springs.
Incorrect engine oil Ensure the correct weight of oil is being
used.
Dirty armature commutator Clean commutator.
Shorted or open armature Replace armature.
Loose or faulty electrical connections Correct.
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